Image:North Fork Toutle River valley in November 1983.jpg

From Wikipedia, the free encyclopedia

No higher resolution available.

North_Fork_Toutle_River_valley_in_November_1983.jpg‎ (543 × 353 pixel, file size: 39 KB, MIME type: image/jpeg)

This downstream view of the North Fork Toutle River valley, north and west of St. Helens, shows part of the nearly 2/3 cubic miles (2.3 cubic kilometers) of debris avalanche that slid from the volcano on May 18. This is enough material to cover Washington, D.C. to a depth of 14 feet (4 meters). The avalanche traveled approximately 15 miles (24 kilometers) downstream at a velocity exceeding 150 miles per hour (240 kilometers/hour). It left behind a hummocky deposit with an average thickness of 150 feet (45 meters) and a maximum thickness of 600 feet (180 meters). (November 30, 1983, by Lyn Topinka, USGS/CVO)

USGS image from

Public Domain

This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy.

File history

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.
Click on date to download the file or see the image uploaded on that date.

  • (del) (cur) 02:09, 23 May 2004 . . Maveric149 ( Talk | contribs) . . 543×353 (40,153 bytes) ( USGS image from [http://vulcan.wr.usgs.gov/Volcanoes/MSH/SlideSet/ljt_slideset_old.html]<br><br>{{msg:PD}})

  • Edit this file using an external application

    See the setup instructions for more information.

The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
Retrieved from "http://en.wikipedia.org/wiki/Image:North_Fork_Toutle_River_valley_in_November_1983.jpg"